Cured silicone particles and cosmetic incorporating same therein

Abstract

Cured silicone particles are disclosed. The cured silicone particles are obtained by curing a curable silicone composition comprising at least components (A) through (C), wherein components (A) and (B) are polyorganosiloxanes having certain average formulas, and component (C) is a catalyst. The average particle size of the cured silicone particles is from 0.1 to 500 μm. Related methods and a cosmetic material comprising the cured silicone particles are also disclosed.

The invention claimed is: 
     
       1. Cured silicone particles obtained by curing a curable silicone composition comprising at least the following components (A) through (C), wherein the average particle size of the cured silicone particles is from 0.1 to 500 μm:
 (A) a polyorganosiloxane expressed by the average formula:
   [R a R b   2 SiO(R b   2 SiO) n ] 4 Si 
 
 where n is a number that is 0 or greater, however, in one molecule, at least one n is a number that is 1 or greater; each R a  may be the same or different and is selected from an alkyl group with 1 to 6 carbon atoms, or an alkenyl group with 2 to 12 carbon atoms, however, in one molecule, at least two R a  are alkenyl groups; and each R b  may be the same or different and is selected from an alkyl group with 1 to 6 carbon atoms, an alkenyl group with 2 to 12 carbon atoms, or an aryl group with 6 to 20 carbon atoms; 
 (B) (B-1) a polyorganosiloxane expressed by the average unit formula:
   (R c   3 SiO 1/2 ) p (R c   2 SiO 2/2 ) q (R d SiO 3/2 ) r    
 where each R c  may be the same or different and is selected from a hydrogen atom, an alkyl group with 1 to 6 carbon atoms, or an aryl group with 6 to 20 carbon atoms, however, in one molecule, at least two R c  are hydrogen atoms; and each R d  may be the same or different and is selected from an alkyl group with 1 to 6 carbon atoms, or an aryl group with 6 to 20 carbon atoms, and p, q, and r are all individually selected numbers that are greater than 0 and that satisfy the equation p+q+r=1; and/or 
 (B-2) a polyorganosiloxane expressed by the average formula:
   HR d   2 SiO(R d   2 SiO) m SiR d   2 H 
 
 where m is a number greater than 0, and R d  is the same as described in (B-1); and 
 
 (C) a catalyst for a hydrosilylation reaction. 
 
     
     
       2. The cured silicone particles according to  claim 1 , wherein the curable silicone composition for obtaining the cured silicone particles further comprises (D) a polyorganosiloxane expressed by the average formula:
   R e R d   2 SiO(R d   2 SiO) k SiR d   2 R e    
 where each R e  is an independently selected alkenyl group with 2 to 12 carbon atoms, each R d  is independently selected and defined as in  claim 1 , and k is a number greater than 0. 
 
     
     
       3. A method of manufacturing the cured silicone particles according to  claim 1 , comprising:
 preparing fine particles from a mixture of component (A) and component (B), 
 blending component (C) and the fine particles to prepare fine particles of a curable silicone composition, and 
 curing the curable silicone composition to give the cured silicone particles. 
 
     
     
       4. A method of manufacturing the cured silicone particles according to  claim 1 , comprising:
 mixing component (A), component (B), and component (C) to form a curable silicone composition, 
 producing fine particles of the curable silicone composition, and 
 curing the curable silicone composition to give the cured silicone particles. 
 
     
     
       5. A cosmetic raw material obtained by dispersing the cured silicone particles according to  claim 1  in a water-based solvent or an oil-based solvent. 
     
     
       6. A cosmetic material comprising the cured silicone particles according to  claim 1 . 
     
     
       7. The cosmetic material according to  claim 6 , which is a cosmetic material for skin. 
     
     
       8. The cosmetic material according to  claim 7 , which is a makeup cosmetic material or sunscreen agent. 
     
     
       9. A method of preparing cured silicone particles, said method comprising:
 forming a curable silicone composition, 
 producing fine particles of the curable silicone composition, and 
 curing the curable silicone composition to give the cured silicone particles; 
 wherein the curable silicone composition comprises at least the following components (A) through (C), 
 (A) a polyorganosiloxane expressed by the average formula:
   [R a R b   2 SiO(R b   2 SiO) n ] 4 Si 
 
 where n is a number that is 0 or greater, however, in one molecule, at least one n is a number that is 1 or greater; each R a  may be the same or different and is selected from an alkyl group with 1 to 6 carbon atoms, or an alkenyl group with 2 to 12 carbon atoms, however, in one molecule, at least two R a  are alkenyl groups; and each R b  may be the same or different and is selected from an alkyl group with 1 to 6 carbon atoms, an alkenyl group with 2 to 12 carbon atoms, or an aryl group with 6 to 20 carbon atoms; 
 (B) (B-1) a polyorganosiloxane expressed by the average unit formula:
   (R c   3 SiO 1/2 ) p (R c   2 SiO 2/2 ) q (R d SiO 3/2 ) r    
 where each R c  may be the same or different and is selected from a hydrogen atom, an alkyl group with 1 to 6 carbon atoms, or an aryl group with 6 to 20 carbon atoms, however, in one molecule, at least two R c  are hydrogen atoms; and each R d  may be the same or different and is selected from an alkyl group with 1 to 6 carbon atoms, or an aryl group with 6 to 20 carbon atoms, and p, q, and r are all individually selected numbers that are greater than 0 and that satisfy the equation p+q+r=1; and/or 
 (B-2) a polyorganosiloxane expressed by the average formula:
   HR d   2 SiO(R d   2 SiO) m SiR d   2 H 
 
 where m is a number greater than 0, and R d  is the same as described in (B-1); and 
 
 (C) a catalyst for a hydrosilylation reaction. 
 
     
     
       10. The method of  claim 9 , wherein forming the curable silicone composition comprises mixing component (A), component (B), and component (C). 
     
     
       11. The method of  claim 9 , wherein forming the curable silicone composition comprises preparing fine particles from a mixture of component (A) and component (B), and blending component (C) and the fine particles. 
     
     
       12. The method of  claim 9 , wherein the curable silicone composition further comprises (D) a polyorganosiloxane expressed by the average formula:
   R e R d   2 SiO(R d   2 SiO) k SiR d   2 R e    
 where each R e  is an independently selected alkenyl group with 2 to 12 carbon atoms, each R d  is independently selected and defined as in  claim 9 , and k is a number greater than 0. 
 
     
     
       13. A method of preparing a cosmetic raw material, said method comprising:
 forming a curable silicone composition, 
 producing fine particles of the curable silicone composition, 
 curing the curable silicone composition to give the cured silicone particles; and 
 dispersing the cured silicone particles in a water-based solvent or an oil-based solvent to give the cosmetic raw material; 
 wherein the curable silicone composition comprises at least the following components (A) through (C), 
 (A) a polyorganosiloxane expressed by the average formula:
   [R a R b   2 SiO(R b   2 SiO) n ] 4 Si 
 
 where n is a number that is 0 or greater, however, in one molecule, at least one n is a number that is 1 or greater; each R a  may be the same or different and is selected from an alkyl group with 1 to 6 carbon atoms, or an alkenyl group with 2 to 12 carbon atoms, however, in one molecule, at least two R a  are alkenyl groups; and each R b  may be the same or different and is selected from an alkyl group with 1 to 6 carbon atoms, an alkenyl group with 2 to 12 carbon atoms, or an aryl group with 6 to 20 carbon atoms; 
 (B) (B-1) a polyorganosiloxane expressed by the average unit formula:
   (R c   3 SiO 1/2 ) p (R c   2 SiO 2/2 ) q (R d SiO 3/2 ) r    
 where each R c  may be the same or different and is selected from a hydrogen atom, an alkyl group with 1 to 6 carbon atoms, or an aryl group with 6 to 20 carbon atoms, however, in one molecule, at least two R c  are hydrogen atoms; and each R d  may be the same or different and is selected from an alkyl group with 1 to 6 carbon atoms, or an aryl group with 6 to 20 carbon atoms, and p, q, and r are all individually selected numbers that are greater than 0 and that satisfy the equation p+q+r=1; and/or 
 (B-2) a polyorganosiloxane expressed by the average formula
   HR d   2 SiO(R d   2 SiO) m SiR d   2 H 
 
 where m is a number greater than 0, and R d  is the same as described in (B-1); and 
 
 (C) a catalyst for a hydrosilylation reaction.